Texas Instruments TPS3123G15DBVTG4

Overview

TPS3123G15DBVTG4 from Texas Instruments is an ultra-low-voltage processor supervisory IC with 1.40 V reset threshold, 180 ms power-on reset delay, manual reset (MR) input, and watchdog timer (WDI) functionality. It operates from 0.75 V to 3.3 V supply, draws 14 µA typical supply current, and delivers open-drain active-low RESET output - used for reliable initialization of low-voltage DSPs and microcontrollers in battery-powered systems.

For engineers reviewing the TPS3123G15DBVTG4 datasheet, TPS3123G15DBVTG4 pinout, TPS3123G15DBVTG4 application, or TPS3123G15DBVTG4 equivalent, key selection considerations include its 1.40 V threshold accuracy (±50 mV), MR-triggered reset assertion, WDI timeout of 0.8–2.1 s, SOT23-5 package compatibility, and -40°C to 85°C industrial temperature range.

Technical Context

The TPS3123G15DBVTG4 integrates a precision voltage reference, hysteresis-controlled threshold detector (1.40 V ±50 mV), and internal 180 ms reset timer. Its MR input accepts logic-level signals (0 V to VDD+0.3 V) and triggers immediate active-low RESET assertion independent of VDD level.

It features a watchdog circuit requiring periodic WDI transitions; failure to retrigger within 0.8–2.1 s forces RESET assertion for 180 ms. The open-drain RESET output supports pull-up to any voltage ≤3.6 V and sinks up to 5 mA, enabling flexible interface with diverse host logic families.

Key Specifications

Pinout & Package

SOT23-5 package (DBV), 2.9 mm × 1.6 mm footprint, 1.45 mm height, surface-mount compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar supervisory circuit applications.

Compared with TPS3123G15DBVTG4, TPS3123J12DBVT offers lower threshold for 1.2 V systems but identical supervision architecture, while TPS3808G15DBVR trades MR and ultra-low current for push-pull output and delay flexibility - making TPS3123G15DBVTG4 optimal for fixed 1.5 V rails with manual reset and battery-life constraints.

Availability

TPS3123G15DBVTG4 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and wireless edge gateways requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for TPS3123G15DBVTG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and digital signal technologies, with decades of experience in power management and system supervision ICs.

The TPS312x family was designed specifically for ultra-low-voltage DSP and microcontroller supervision, addressing the need for sub-1 V operation, precise threshold control, and integrated watchdog functionality in space-constrained portable and industrial systems.

FAQ

What is the exact reset threshold voltage of the TPS3123G15DBVTG4?

The TPS3123G15DBVTG4 has a nominal reset threshold voltage of 1.40 V, with a guaranteed range of 1.35 V to 1.45 V over the full −40°C to +85°C operating temperature range. This value is factory-trimmed and does not require external calibration or adjustment. The threshold exhibits ±0.2% typical drift over temperature, confirmed in TI's SLVS227B datasheet Figure 9.

Does the TPS3123G15DBVTG4 support manual reset functionality?

Yes, the TPS3123G15DBVTG4 includes a dedicated MR (manual reset) input on Pin 4. A logic-low signal (≤0.3×VDD) on MR forces immediate active-low assertion of the RESET output, independent of VDD level or watchdog state. An internal 27 kΩ pullup resistor holds MR high when unconnected, eliminating the need for an external pullup in most designs.

What is the watchdog timeout behavior of the TPS3123G15DBVTG4?

The TPS3123G15DBVTG4 watchdog timer times out between 0.8 s and 2.1 s if no valid edge (rising or falling) occurs on the WDI pin. Upon timeout, it asserts the open-drain RESET output for the full 180 ms delay period and resets the watchdog counter. The WDI pin accepts transitions at any VDD ≥0.75 V and requires no external clock source.

Can the TPS3123G15DBVTG4 operate with a 0.8 V supply voltage?

Yes, the TPS3123G15DBVTG4 is fully specified down to 0.75 V supply voltage. At VDD = 0.8 V, it maintains functional reset supervision, MR response, and watchdog operation - though RESET assertion remains tied to the 1.40 V threshold, meaning the device will hold RESET active until VDD rises above that level. This enables use during cold-cranking or deep brownout conditions.

What package type and footprint does the TPS3123G15DBVTG4 use?

The TPS3123G15DBVTG4 uses the SOT23-5 (DBV) package: a 5-pin, surface-mount plastic package measuring 2.9 mm × 1.6 mm with 0.95 mm pitch and 1.45 mm maximum height. It is compatible with standard PCB assembly processes including reflow soldering per JEDEC J-STD-020, and shares footprint compatibility with other TPS312x variants in the same DBV variant.